#include <iostream>
#include <queue>

using namespace std;

typedef pair<int, int> PII;

int main()
{
	queue<PII> q;
	
	for(int i = 1; i <= 10; i++)
	{
		q.push({i, i * 10});
	}
	
	while(q.size())
	{
		auto t = q.front();
		q.pop();
		
		cout << t.first << " " << t.second << endl;
	}
		
	return 0;
}




